package com.my.seckill.controller;

import com.my.seckill.pojo.User;
import com.my.seckill.service.IGoodsService;
import com.my.seckill.service.IUserService;
import com.my.seckill.vo.DetailVo;
import com.my.seckill.vo.GoodsVo;
import com.my.seckill.vo.RespBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.thymeleaf.Thymeleaf;
import org.thymeleaf.context.WebContext;
import org.thymeleaf.spring5.view.ThymeleafViewResolver;
import org.thymeleaf.util.StringUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;
import java.util.concurrent.TimeUnit;


@Controller
@RequestMapping("/goods")
public class GoodsController {


    @Autowired
    private IUserService userService;

    @Autowired
    private IGoodsService goodsService;

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private ThymeleafViewResolver thymeleafViewResolver;

    /*
     * 10000*3
     * windos优化前QPS 2933
     *      缓存后QPS 3952
     * */
    @RequestMapping(value ="/toList", produces = "text/html;charset=utf-8", method = RequestMethod.GET)
    @ResponseBody
    public String toList(Model model, User user, HttpServletRequest request, HttpServletResponse response){
        //从redis中获取页面，非空则返回
        ValueOperations valueOperations = redisTemplate.opsForValue();
        String html = (String) valueOperations.get("goodsList");
        if (!StringUtils.isEmpty(html)) {
            return html;
        }
        model.addAttribute("user",user);
        model.addAttribute("goodsList", goodsService.findGoodsVo());
        //为空，手动渲染，存入redis并返回
        WebContext webContext = new WebContext(request, response, request.getServletContext(), request.getLocale(), model.asMap());
        html = thymeleafViewResolver.getTemplateEngine().process("goodsList", webContext);
        if (!StringUtils.isEmpty(html)) {
            valueOperations.set("goodsList", html, 60, TimeUnit.SECONDS);
        }
        return html;
    }

    //页面缓存
    @RequestMapping(value = "/toDetail2/{goodsId}", produces = "text/html;charset=utf-8")
    @ResponseBody
    public String toDetail2(@PathVariable Long goodsId , Model model, User user,HttpServletRequest request, HttpServletResponse response){
        ValueOperations valueOperations = redisTemplate.opsForValue();
        //Redis中获取页面，如果不为空，直接返回页面
        String html = (String) valueOperations.get("goodsDetail:" + goodsId);
        if (!StringUtils.isEmpty(html)) {
            return html;
        }
        model.addAttribute("user",user);
        GoodsVo goodsVo=goodsService.findGoodsVoByGoodsId(goodsId);
        Date startDate = goodsVo.getStartDate();
        Date endDate = goodsVo.getEndDate();
        Date nowDate = new Date();
        //秒杀状态
        int seckillStatus = 0;
        //秒杀倒计时
        int remainSeconds;

        if (nowDate.before(startDate)) {
            //秒杀还未开始
            remainSeconds = (int) ((startDate.getTime() - nowDate.getTime()) / 1000);
        } else if (nowDate.after(endDate)) {
            //秒杀已经结束
            seckillStatus = 2;
            remainSeconds = -1;
        } else {
            //秒杀进行中
            seckillStatus = 1;
            remainSeconds = 0;
        }
        model.addAttribute("secKillStatus", seckillStatus);
        model.addAttribute("remainSeconds", remainSeconds);
        model.addAttribute("goods", goodsVo);
        WebContext context = new WebContext(request, response, request.getServletContext(), request.getLocale(),
                model.asMap());
        html = thymeleafViewResolver.getTemplateEngine().process("goodsDetail", context);
        if (!StringUtils.isEmpty(html)) {
            valueOperations.set("goodsDetail:" + goodsId, html, 60, TimeUnit.SECONDS);
        }
        return html;
    }



    //页面静态化
    @RequestMapping("/detail/{goodsId}")
    @ResponseBody
    public RespBean toDetail(@PathVariable Long goodsId , User user){
        GoodsVo goodsVo=goodsService.findGoodsVoByGoodsId(goodsId);
        Date startDate = goodsVo.getStartDate();
        Date endDate = goodsVo.getEndDate();
        Date nowDate = new Date();
        //秒杀状态
        int seckillStatus = 0;
        //秒杀倒计时
        int remainSeconds;
        if (nowDate.before(startDate)) {//秒杀还未开始
            remainSeconds = (int) ((startDate.getTime() - nowDate.getTime()) / 1000);
        } else if (nowDate.after(endDate)) {//秒杀已经结束
            seckillStatus = 2;
            remainSeconds = -1;
        } else { //秒杀进行中
            seckillStatus = 1;
            remainSeconds = 0;
        }
        DetailVo detailVo=new DetailVo();
        detailVo.setUser(user);
        detailVo.setGoodsVo(goodsVo);
        detailVo.setSecKillStatus(seckillStatus);
        detailVo.setRemainSeconds(remainSeconds);
        return RespBean.success(detailVo);
    }

}
